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ST-2112D (450Mhz ~ 520Mhz)
UHF FM DIGITAL TRANSCEIVER
SERVICE MANUAL
SmarTrunk Systems, INC. ST-2112D SM R1.2
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 2
Table of Contents 1. Specifications: ............................................................................................................................... 5
2. ST-2112 EXPLODED VIEW .............................................................................................................. 6
3. ST-2112 SIMPLIFIED DIAGRAM ..................................................................................................... 7
4. - ST-2112 RF DESCRIPTION ................................................................................................................ 8
4.1. Circuit Configuration ................................................................................................................. 9
4.2. Receiver System ........................................................................................................................ 9
4.2.1. Front-end RF Receiver ........................................................................................................... 9
4.2.2. ANALOG Audio Processing .................................................................................................... 9
4.2.3. Virtual Squelch Circuit ........................................................................................................... 9
4.2.4. Virtual VOLUME CONTROL .................................................................................................. 10
4.2.5. Sub audio signaling ............................................................................................................. 10
4.2.6. ANALOG AUDIBLE SIGNALING ............................................................................................. 10
4.2.7. DIGITAL AUDIO PROCESSING .............................................................................................. 10
4.3. Transmitter System ................................................................................................................. 11
4.3.1. ANALOG TX SIGNAL ............................................................................................................. 11
4.3.2. DIGITAL TX AUDIO: .............................................................................................................. 11
4.3.3. Drive and Final Amplifier Stages ......................................................................................... 11
4.3.4. Automatic Transmit Power Control .................................................................................... 12
5. RC-2112 ALIGNMENT .................................................................................................................. 13
5.1. Introduction ............................................................................................................................ 13
5.2. ALIGNMENT:............................................................................................................................ 13
5.3. Alignment Procedure .............................................................................................................. 14
5.3.1. GENERAL ALIGNMENT CONSIDERATIONS: .......................................................................... 14
5.4. MAIN RADIO ALIGNMENT ....................................................................................................... 15
5.5. TRANSMITTER ALIGNMENT: ................................................................................................... 15
5.5.1. Main Clock alignment: ........................................................................................................ 16
5.5.2. Transmit Power alignment: ................................................................................................. 17
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 3
5.5.2.1. High POWER LEVEL ALIGNMENT ..................................................................................... 17
5.5.2.2. Mid POWER LEVEL ALIGNMENT ...................................................................................... 18
5.5.2.3. LOW POWER LEVEL ALIGNMENT .................................................................................... 18
5.5.3. ANALOG MAXIMUM DEVIATION ........................................................................................ 18
5.5.4. Modulation Gain alignment: ............................................................................................... 18
5.5.5. FDMA DATA MODULATION alignment: .............................................................................. 19
5.5.6. TDMA DATA MODULATION alignment: .............................................................................. 20
5.5.7. EIA tones Level Alignment: ................................................................................................. 20
5.5.8. DTMF signaling level alignment: ......................................................................................... 20
5.5.9. DCS signaling alignment: ..................................................................................................... 21
5.5.10. CTCSS signaling alignment .................................................................................................. 21
5.5.11. FSK signaling alignment: ..................................................................................................... 22
5.6. RECEIVER ALIGNMENT ............................................................................................................ 23
5.6.1. DISCRIMINATOR GAIN ......................................................................................................... 23
6. COMPLEMENTARY RADIO ALIGNMENT ...................................................................................... 24
6.1. BATTERY WARNING LEVEL ...................................................................................................... 24
7. COMPLIMENTARY USER ALIGNMENT ......................................................................................... 25
7.1. OPTION ALIGNMENT: .............................................................................................................. 25
7.1.1. ANALOG Microphone gain: ................................................................................................. 25
7.1.2. ANALOG External Mic Gain: ................................................................................................ 25
7.1.3. ANALOG AGC ...................................................................................................................... 26
7.1.4. DIGITAL AGC ........................................................................................................................ 26
7.1.5. MINIMUM VOLUME LEVEL: ................................................................................................ 27
7.1.6. SQUELCH LEVEL: .................................................................................................................. 27
7.1.7. DISABLE RF POWER ............................................................................................................. 27
8. RADIO APPEARANCE ALIGNMENT .............................................................................................. 28
8.1. DISPLAYS AND LEDS: ............................................................................................................... 28
8.1.1. Auto backlight delay alignment: ......................................................................................... 28
8.1.2. Power on Text: .................................................................................................................... 28
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 4
8.1.3. Leds: .................................................................................................................................... 29
8.2. Tones ....................................................................................................................................... 29
8.3. ANNUNCIATION ...................................................................................................................... 29
9. ST-2112 SCHEMATIC ................................................................................................................... 32
10. ST-2112 FROM BOARD SCHEMATIC ............................................................................................ 33
11 ST-2112 COMPONENT LOCATOR (TOP LAYER) ............................................................................... 34
12 ST-2112 COMPONENT LOCATOR (BOTTOM LAYER) ....................................................................... 35
13 ST-2112 PCB TOP LAYER .................................................................................................................. 36
14 ST-2112 PCB BOTTOM LAYER .......................................................................................................... 37
15 ST-2112 PCB GROUND LAYER ......................................................................................................... 38
16 ST-2112 PCB POWER LAYER ............................................................................................................ 39
17 ST-2112 FRONT BOARD COMPONENT LOCATOR (TOP LAYER) ....................................................... 40
18 ST-2112 FRONT BOARD COMPONENT LOCATOR (BOTTOM LAYER)............................................... 41
19 ST-2112D BOM ................................................................................................................................ 42
20 ST-2112 KEYBOARD & DISPLAY BOM .............................................................................................. 51
21 ACCESSORY PORT: ........................................................................................................................... 53
22 ST-2112 SERVICE MANUAL REVISIONS ........................................................................................... 55
1. Specifications:
SPECIFICATION ST-2112C
GEN
ERA
L
Frequency Range [Mhz] 450 TO 520
Channels 512
Groups/Banks 64
Power [Vdc] 6.4 to 8.8
Dimensions [mm] 130(H)x36(D)x52(W)
Weight [gr] (oz) 320 - (11.3)
Temperature range - 30 °C ~ 60 °C (-22°F ~ +140°F)
Signaling 51 CTCSS tones / 183 DCS tones / 65534 SDR IDs
Reverse Burst No
Display 128x64 (supports international characters)
Emergency call Yes
GPS Option
Channel Scan Yes
BCLO / BTLO Yes
Power Saver control Yes
TOT Yes
Radio Kill/Alive Yes
Adjustable Power Selection Auto + H/M/L
Key lock Yes
Adjustable Squelch Level 16 Step
Password Yes
Key Function selection Yes
TRA
NSM
IT
MAX RF power 4 W
Frequency Stability >1PPM
Bandwidth [Khz] 6.25/12.5/25
Adjacent Channel Power -65dBC (typ)
SNR 45dB typ
Analog harmonic distortion 3% typ (AF 1Khz, 60% deviation)
Data transmit rate 2400/4800/9600 bps
Max frequency deviation 2.5Khz@12.5Khz BW/5Khz@25Khz BW
Analog Modulation type 11K0F3E, 25K0F3E
TDMA Emissions 8K30F7E, 8K30F7D
FDMA Digital emissions 6K25F1E, 6K25F1D, 8K30F1E, 8K30F1D, 8K30F1W
Ext. Mic. Impedance 600 Ohms
REC
EIV
ER
Analog Sensitivity 0.25uV (12dB Sinad)
Digital Sensitivity 0.25uV (3% BER)
Image rejection 60dB typ
Adjacent Channel selectivity 65dB typ @25KHz BW
HUM and NOISE ratio 45dB
Speaker Audio Power 1W
External audio power 1W
Specifications subject to change without notice or obligation
2. ST-2112 EXPLODED VIEW
ST-2112V
Jack Chang
Daniel Martin
2 . ST-2112 EXPLODED VIEW
3. ST-2112 SIMPLIFIED DIAGRAM
LPF Ant Sw
D1/D3
Final AMP
Q1
Power Detection
D2
Driver Q3
Buffer AMP
Q2
TX CTRL
[U3]
CLOCK
[Y1] POWER
CTRL
[U2]
FLASH
MEMORY
[U4]
RAM MEMORY
[U7]
DISPLAY
GPS
G-SENSOR
PWM
KEYBOARD SIDE KEYS
USB SERIAL PORT
Main Processor [U8]
Radio
U1
Audio Processor Modem
[U5]
VOCODER
[U6]
CLOCK
[Y2]
MIC
AMP
[U12]
AUDIO PA
[U10]
CLOCK
[Y3]
JP2
Notes:
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 9
4. - ST-2112 RF DESCRIPTION
4.1. Circuit Configuration
The receiver is a single receiver with
built-in DSP fully integrated. Incoming signals from the antenna,
after passing through LPF filter, are fed direct to the DSP down
converter to get the baseband voice from 0Hz to 3500Hz.
Demodulated signals are filtered and conditioned onto a second DSP based filter, which also includes a
high efficiency 4FSK modem.
For digital demodulation, the recovered data is fed into a vocoder, which converts the data to voice.
Analog voice from the analog path
or the analog voice recovered from the vocoder, are fed into an audio power amplifier.
Transmit signal frequency is generated by integrated VCO and
PLL. RF frequency generated by the integrated RF chip is amplified into
a 3-step amplifier then filtered by a low pass filter to be applied to the antenna.
4.2. Receiver System
4.2.1. Front-end RF Receiver
Incoming RF signals from the antenna are delivered to the
Receiver Unit and pass through a Low-pass filter, antenna switching
diode, and then fed to the receiver (U1) passing through a limiter BPF.
4.2.2. ANALOG Audio Processing
The RF signal is tuned by U1, which
includes a base band DSP audio processing, recovering flat audio from DC up to 3500 hz.
The detected audio is amplified,
filtered and conditioned inside of U5 which also includes a de-emphasize filtering shape for
received audio signals The output of the filtered and
conditioned audio is delivered to an audio power amplifier (U10) then to
the speaker passing through the external audio connector switch.
4.2.3. Virtual Squelch Circuit
S/N ratio is measured by the
receiver (U1) as the result of the analysis of the signal and the noise
of the carrier. The output is sent to the main processor as a digital frame, which is analyzed by radio
firmware, removing noise then qualifying the signal level. If the
signal level is higher than the
LPF SWITCH PROTECTION FILTER
RECEIVER [U1]
RECEIVER [U1]
AUDIO PROCESSOR
[U5] AMPLIFIER
[U10]
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 10
expected for the current programmed squelch threshold,
then the processor analyzes the expected signaling programmed on
the current channel table. In case of not any signaling is required, or the signal has been
detected, the processor ask to the audio processor (U5) to open the audio path, unmuting the audio
amplifier (U10).
4.2.4. Virtual VOLUME CONTROL
The potentiometer position (RV1) is
measured by one analog to digital converter on the audio processor (U5), and then the information is
reported to the main processor. The firmware immediately adjusts the
audio processor path gain to get the appropriate overall circuitry volume control.
Minimum volume, emergency and private audio level are controlled only by software overriding the
information received from the DAC on U5.
4.2.5. Sub audio signaling
Received sub audio signaling like
CTCSS and DCS are received and processed by the receiver (U1) then detected on the audio processor
(U5). Once decoded, the sub audio signaling is reported to the
processor where the firmware compares it with the value programmed into the current
channel programming.
If the received signaling matches the channel programming, then the main processor (U8) requests the
audio processor (U5) to open the audio patch.
4.2.6. ANALOG AUDIBLE SIGNALING
DTMF signals, MDC1200 and tone signals are processed and decoded
by the audio processor (U5). Decoded information or received tone is reported to the main
processor (U8).
4.2.7. DIGITAL AUDIO PROCESSING
Digital received information is
processed by the receiver DSP (U1)
then delivered to the audio processor (U5), which includes a
high speed (4FSK) modem. Data decoded by the modem is transferred to the main processor
(U8) which de-encrypts the information, checks the integrity,
corrects the wrong bits and extract the audio information form the received frame.
The portion of the data received,
error free, is moved to the vocoder (U6).
The vocoder re-builds the audio from the compressed data then applies filter it, adjust the volume
RECEIVER [U1]
AUDIO PROCESSOR
[U5]
AMPLIFIER [U10]
MAIN PROCESSOR
[U8]
VOCODER U6]
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 11
and fed it to the audio power amplifier (U10).
4.3. Transmitter System
4.3.1. ANALOG TX SIGNAL
The AF signal from the internal
microphone (MK1) or external microphone (J5) are processed as differential signal, then it is
conditioned and transformed into common mode by the microphone
pre-amplifier (U12). The result of the conditioned in-
band filtered signal is fed to the Audio Processor (U5), which
provides audio compander, emphasize, limitation, encryption, etc.
The high audio band of the signal from 300 to 3500 Hz are directly fed
to the transmitter (U1), which performs a direct modulation of a
generated carrier. Low frequency signaling audio are
fed directly to Y1 VC TXCO main clock generator and U1 with a
corresponding balance controlled by software.
4.3.2. DIGITAL TX AUDIO:
The AF signal from the internal
microphone (MK1) or external
microphone (J5) are fed directly to the vocoder chip (U6) which
perform the data codification, delivering the digitized and encoded audio as digital frames which are
processed by the Main Processor U8, which add a FEC (Frame Error
Correction), encrypt the information and add the user related information as user ID, etc.
The final data frame is fed to the Audio Processor (U5) which has a
built in modem, which operates for FDMA or TDMA signals, controlling
the modulation of the Transmitter (U1) through the VC TXCO for DC to low frequencies and the direct
modulation for higher frequencies.
4.3.3. Drive and Final Amplifier Stages
Final RF is amplified on Q2
(2SC3356) then filtered to be fed to Q3 (2SK3475) then finally amplified by Q1 (2SK3476) up to 5 watts
output power. The transmit signal then passes
through the antenna switch D1 (BAR63) and is low-pass filtered to
suppress harmonic spurious radiation before delivery to the antenna
AMPLIFIER [U12]
AUDIO
PROCESSOR [U5]
TRANSMITTER [U1]
VC TXCO [Y1]
AUDIO PROCESSOR
[U5]
TRANSMITTER [U1]
VC TXCO [Y1]
MAIN PROCESSOR
[U8] VOCODER
[U6]
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 12
4.3.4. Automatic Transmit Power
Control
The RF power detector (RB705D) detects transmitted feedback then
sends the readout to audio processor U5 (CMX-7141). Audio amplifier compares the transmitted
power against the referred level stored on current channel memory adjusting the power control level
generated as reference by one DAC output on the same Audio
processor (U5) then amplified by U2 (MCP6241U) controlling the gate current on Q1 and Q17.
Evenly when power level is adjusted by software on three levels (Hi, Med,
Lo) the power value can be adjusted to any desired value between zero
and 5Watts by the alignment software.
Notes:
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 13
5. RC-2112 ALIGNMENT
5.1. Introduction
The ST-2112 series is carefully
aligned in factory for the specified performance, across the frequency
range depending for each version. Realignment should therefore not be necessary except in the event of
a component failure, or altering version type.
All component replacement and service should be performed only by
an authorized SmarTrunk representative, or the warranty policy may be void.
The following procedures cover the
sometimes critical and tedious adjustments that are not normally required once the transceiver has
left the factory. However, if damage occurs and
some parts subsequently are placed, realignment may be
required. If a sudden problem occurs during normal operation, it is likely due to component failure;
realignment should not be done until after the faulty component has
been replaced. We recommend that servicing be
performed only by authorized SmarTrunk service technicians who are experienced with the
circuitry and fully equipped for repair and align. Therefore, if a fault
is suspected, contact the dealer from whom the transceiver was purchased for instructions
regarding repair. Authorized Smartrunk service technicians
realign all circuits and make complete performance checks to
ensure compliance with factory specifications after replacing any
faulty components.
Those who do undertake any of the following alignments are cautioned to proceed at their own risk.
Problems caused by unauthorized attempts at realignment are not
covered by the warranty policy. Also, SmarTrunk reserves the right
to change circuits and alignment procedures in the interest of improved performance, without
notifying owners.
Under no circumstances should any alignment be attempted unless the normal function and operation
of the transceiver are clearly understood, the cause of the malfunction has been clearly
pinpointed and any faulty components replaced, and
realignment determined to be absolutely necessary.
5.2. ALIGNMENT:
The following test equipment (and
thorough familiarity with its correct use) is necessary for complete
realignment. Correction of problems caused by misalignment resulting from use of improper test
equipment is not covered under the warranty policy.
While most steps do not require all of the equipment listed, the
interactions of some adjustments may require that more complex adjustments be performed
afterwards. Do not attempt to perform only a single step unless it
is clearly isolated electrically from
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 14
all other steps. Have all test equipment ready before beginning,
and follow all of the steps in a section in the order presented.
Required Test Equipment
RF Signal Generator with calibrated output level at 1 GHz
Deviation Meter (linear detector)
In-line Wattmeter with 5 % accuracy at 1 GHz
50 Ohm RF Dummy Load
with power rating 10W at 1 GHz
8 Ohm AF Dummy Load
(Attention: Audio output is BTL output)
Regulated DC Power Supply (standard 7.5 V DC, 3 A)
Frequency Counter with 0.2
ppm accuracy at 1GHz Audio Generator AC Voltmeter
DC Voltmeter UHF Sampling Coupler
IBM PC / compatible Computer with Microsoft® Windows® XP or later
operating system SmarTrunk SDR
Programming software (version 1.0.2 or later)
USB A/B Programming Cable
5.3. Alignment Procedure
Alignment Preparation & Precautions
A 50-Ohm RF Dummy Load and in-line wattmeter must be connected to the main antenna jack in all
procedures that request for
transmission, except where specified otherwise. Correct
alignment is not possible with an antenna.
After completing one-step, read the following steps to determine
whether the same test equipment will be required. If not, remove the test equipment (except dummy load
and wattmeter, if connected) before proceeding.
Correct alignment requires that the ambient temperature be the same
as that of the transceiver and test equipment, and that this
temperature be held constant between 68°F and 86 °F (20°C ~ 30 °C). When the transceiver is
brought into the shop from hot or cold air, it should be required to wait few minutes to come to room
temperature before alignment.
Whenever possible, alignments should be made with oscillator shields and circuit boards firmly
affixed in place. Also, the test equipment must be thoroughly warmed up before beginning.
Note: Signal levels in dB referred to
in the alignment procedure are based on 0 dBm EMF = 1 mV.
5.3.1. GENERAL ALIGNMENT
CONSIDERATIONS:
Evenly if the radio is powered off, the alignment software will detect
it, but some of the test cannot be performed correctly.
Please be sure you turn the radio on before continue with this alignment
procedure.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 15
In case the battery has not enough
charge, the test will be aborted by the software. Please ensure the
battery has more than 50% of remaining charge to complete the test.
5.4. MAIN RADIO ALIGNMENT
Before setup any parameter, run
SDR programming software then select Radio Alignment from top bar menu.
A complementary message will be
displayed on the time the software detects the radio connected to USB port on the computer.
If the radio isn’t connected, then the program will be timed out after 20
seconds.
As soon as the radio is detected, actual radio parameters are loaded.
Once the radio is connected, a new screen pops up showing all alignment parameters. The
software downloads actual alignment parameters stored into
radio memory, so the information displayed on each alignment step is the real value form the previous
alignment.
The radio also stores in a special memory area, original values assigned in factory. You can go
back to those values anytime for any particular alignment step.
In case the radio is password protected, dealer password is
required to access to this alignment menu.
At any time, press to end the alignment procedure then the radio will returns to alignment
menu.
For any transmit related alignment parameter, low power will be used.
5.5. TRANSMITTER ALIGNMENT:
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 16
7.5V Power Supply
PC compatible
On Line Wattimeter30dB pad
Deviation Meter
Frequency Counter
Setup the test equipment as shown for transceiver alignment, apply 7.5
V DC power to the transceiver. The RF parameters are typed on the
alignment software to facilitate the alignment within all radio band
avoiding special programming of the radio before start alignment procedure.
All parameters can be aligned without relationship to any other,
so there is no an order to align. On this way, you can adjust only the
desired parameter, avoiding to waste time realigning other parameters than required.
Before proceed to align any parameter, a desired frequency
must be loaded into both TX and RX. Evenly when the radio has
stable characteristics for all bandwidth, it is recommendable to align on middle of the radio working
band.
5.5.1. Main Clock alignment:
To align the main clock for radio Tx and RX, please select Main Clock
Alignment option Alignment screen.
Fig 12: alignment menu
Actual alignment value will be displayed on alignment slider.
Press [Start] then move the slider to reach the desired value at the time
you checks the Frequency Counter to reach the desired frequency as
shown on Frequency field of the alignment screen.
As soon the desired value is reached, press [Finish] to store the
value on radio memory.
If you want to retrieve factory default, press [Factory] instead of [Start]. You will be asked to confirm
the factory default alignment, and then if you confirm it, original
values from factory will be loaded into current alignment settings.
This confirmation screen will
appears any time you want to realign any parameter to Factory Default.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 17
5.5.2. Transmit Power alignment:
ST-2112 has three power levels to be selected for each channel. High,
medium and low power level can be aligned as per radio usage
requirement. For power alignment, you can do a
fine tuning as per your desire frequency sub-band. The software lets you linearize the complete band
“cutting” the complete band into five steps to let you focus into your
frequency bands. Even when the software has already
assigned the most convenient frequency points to consider the alignment, you still can enter
exactly the frequency of your interest.
5.5.2.1. High POWER LEVEL
ALIGNMENT
To align the High Power level select
Power High Level.
Software automatically retrieves actual level to the alignment slider.
This level has been aligned in factory, but you still can adjust it as per your desires.
To realign, please select [Start] then
move the slider or introduce the
value manually at the time you check the real transmit power on
the wattmeter connected to the radio as recommended on TX
alignment diagram. As soon as [Start] is pressed, the
radio start to transmit a carrier, so please verify the antenna dummy load is properly connected to avoid
any damage to the transmitter.
As soon the desired value is reached, press [Finish] to store the value into radio memory.
If you want to load default High
power only, keeping any other value without any change, press [Factory] instead of [Start]. A pop up window
will ask you to confirm the default parameters upload to the radio power.
Press [OK] to confirm.
As descripted previously, you can manually select the frequency
range to align, divided into five different sub-ranges.
You can also define the right frequency of interest to align, typing
the desired one into the frequency field:
If selected frequency is not
supported by radio hardware, the frequency field will be filled on red. In case the PLL is locked, then it
becomes filled on green.
Please be sure that the PLL is locked as soon as you press [Start],
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 18
otherwise the alignment should be not correct.
5.5.2.2. Mid POWER LEVEL
ALIGNMENT
Repeat the same procedure to align
High Power, but select Power Medium Level on the alignment menu.
5.5.2.3. LOW POWER LEVEL ALIGNMENT
Repeat the same procedure to align High Power, but select Power Low
Level on the alignment menu.
5.5.3. ANALOG MAXIMUM DEVIATION
Maximum deviation for analog signals modulated from ST-2112
can be aligned by Max Deviation
alignment option from the alignment menu.
Actual alignment value will be displayed on alignment slider.
Press [Start] then move the slider to reach the desired value at the time
you checks the deviation meter to reach the desired signaling level for
narrow band operation. Radio will generate a 1000Hz alignment reference tone for alignment
proposes.
As soon the desired value is reached, press [Finish] to store the value on radio memory.
Wide band channels uses the same limiter. No additional wide band
max deviation alignment is required.
If you want to retrieve factory default, press [Factory] instead of
[Start]. You will be asked to confirm the factory default alignment, and then if you confirm it, original
values from factory will be loaded into current alignment settings
5.5.4. Modulation Gain alignment:
This is a critical parameter which may not be realigned to different
values other than factory default.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 19
Lower gain means a very high
microphone gain must be assigned to get the proper radio voice
deviation, and higher gain means a risk because the max deviation limit must be reached by any signal
which makes the limiter to introduce distortion to avoid over deviation.
Under your risk, if you still prefer to
realign the overall modulation gain, you must select Modulator Gain on Alignment screen.
Actual alignment value will be displayed on alignment slider.
Press [Start] then move the slider to reach the desired value at the time
you checks the deviation meter to reach the desired signaling level for
narrow band operation. For this alignment step, the radio
does not generate any signal. It only stores the new value of the overall modulation gain into the memory.
As soon the desired value is
reached, press [Finish] to store the value on radio memory.
If you want to retrieve factory
default, press [Factory] instead of [Start]. You will be asked to confirm
the factory default alignment, and then if you confirm it, original
values from factory will be loaded into current alignment settings.
5.5.5. FDMA DATA MODULATION
alignment:
To align 4FSK signaling deviation
for FDMA mode, select FDMA Deviation on Alignment screen.
Actual alignment value will be
displayed on alignment slider. Press [Start] then move the slider to
reach the desired value at the time you checks the deviation meter to reach the desired signaling level for
narrow band operation. Radio will generate a 1000Hz reference tone
for alignment proposes. As soon the desired value is
reached, press [Finish] to store the value on radio memory.
If you want to retrieve factory
default, press [Factory] instead of [Start]. You will be asked to confirm the factory default alignment, and
then if you confirm it, original values from factory will be loaded
into current alignment settings.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 20
5.5.6. TDMA DATA MODULATION
alignment:
To align 4FSK signaling deviation for TDMA mode, select TDMA Deviation on Alignment screen.
Actual alignment value will be displayed on alignment slider.
Press [Start] then move the slider to reach the desired value at the time
you check the deviation meter to reach the desired signaling level for narrow band operation. Radio will
generate a 1000Hz reference tone for alignment proposes.
As soon the desired value is reached, press [Finish] to store the
value on radio memory.
If you want to retrieve factory default, press [Factory] instead of
[Start]. You will be asked to confirm the factory default alignment, and then if you confirm it, original
values from factory will be loaded into current alignment settings.
5.5.7. EIA tones Level Alignment:
EIA signaling generated by ST-2112 must be aligned by selecting EIA
Tones Level alignment option from the alignment menu.
Actual alignment value will be
displayed on alignment slider. Press [Start] then move the slider to
reach the desired value at the time you check the deviation meter to
reach the desired signaling level for narrow band operation. Radio will generate a 1000Hz reference tone
for alignment proposes. As soon the desired value is
reached, press [Finish] to store the value on radio memory.
If you want to retrieve factory default, press [Factory] instead of
[Start]. You will be asked to confirm the factory default alignment, and
then if you confirm it, original values from factory will be loaded into current alignment settings.
5.5.8. DTMF signaling level alignment:
DTMF signaling generated by ST-2112 must be aligned by selecting
DTMF Level alignment option from the alignment menu.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 21
Actual alignment value will be
displayed on alignment slider.
Press [Start] then move the slider to reach the desired value at the time you check the deviation meter to
reach the desired signaling level for narrow band operation. Radio will generate a 1000Hz alignment
reference tone for alignment proposes.
As soon the desired value is reached, press [Finish] to store the
value on radio memory.
If you want to retrieve factory default, press [Factory] instead of
[Start]. You will be asked to confirm the factory default alignment, and then if you confirm it, original
values from factory will be loaded into current alignment settings.
5.5.9. DCS signaling alignment:
DCS signaling encoded from ST-
2112 must be aligned by selecting DCS Level alignment option from the alignment menu.
Actual alignment value will be displayed on alignment slider.
Press Start then move the slider to
reach the desired value at the time you check the deviation meter to reach the desired signaling level for
narrow band operation. Radio will generate 134.4Hz audio tone for alignment proposes.
As soon the desired value is
reached, press [Finish] to store the value on radio memory.
If you want to retrieve factory
default, press [Factory] instead of [Start]. You will be asked to confirm the factory default alignment, and
then if you confirm it, original values from factory will be loaded into current alignment settings.
5.5.10. CTCSS signaling alignment
CTCSS signaling encoded from ST-2112 can be aligned by selecting
CTCSS Level alignment option from the alignment menu.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 22
Actual alignment value will be
displayed on alignment slider. Press [Start] then move the slider to
reach the desired value at the time you check the deviation meter to reach the desired signaling level for
narrow band operation. Radio will generate 123.0Hz audio tone for
alignment proposes. As soon the desired value is
reached, press [Finish] to store the value on radio memory.
If you want to retrieve factory
default, press [Factory] instead of [Start]. You will be asked to confirm the factory default alignment, and
then if you confirm it, original values from factory will be loaded
into current alignment settings.
5.5.11. FSK signaling alignment:
To align FSK/PSK signaling
deviation, select FSK Mod Level on Alignment screen.
Actual alignment value will be displayed on alignment slider.
Press [Start] then move the slider to
reach the desired value at the time you check the deviation meter to reach the desired signaling level for
narrow band operation. Radio will generate a 1000Hz alignment reference tone for alignment
proposes.
As soon the desired value is reached, press [Finish] to store the value on radio memory.
If you want to retrieve factory default, press [Factory] instead of [Start]. You will be asked to confirm
the factory default alignment, and then if you confirm it, original values from factory will be loaded
into current alignment settings.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 23
5.6. RECEIVER ALIGNMENT
Setup the test equipment as shown
for Receiver alignment, apply 7.5 V DC power to the transceiver.
The RF frequency must be loaded on Receiver Frequency of the
alignment software to facilitate the alignment within all radio band avoiding special programming of
the radio before start alignment procedure.
7.5V Power Supply
PC compatible
RF signal generator
RECEIVER ALIGNMENT SETUP
5.6.1. DISCRIMINATOR GAIN
This is a critical parameter which may not be realigned to different
values other than factory default.
Under your risk, if you still prefer to realign the overall modulation gain,
you must select Discriminator Gain on Alignment screen.
Actual alignment value will be
displayed on alignment slider. Press [Start] then move the slider to
reach the desired value.
As soon the desired value is reached, press [Finish] to store the value on radio memory.
Default value is 0.
If you want to retrieve factory default, press [Factory] instead of
[Start]. You will be asked to confirm the factory default alignment, and then if you confirm it, original
values from factory will be loaded into current alignment settings.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 24
6. COMPLEMENTARY RADIO
ALIGNMENT
6.1. BATTERY WARNING LEVEL
ST-2112 generates acoustic and visual alerts when battery has reached a low voltage.
Visual information is displayed on
battery icon which flashes with a cross on it when the minimum hardware value is reached.
Acoustic signaling is generated by the radio when the battery warning
voltage is reached and this value can be adjusted by the dealer.
To align battery warning levels, select Battery Warning Level on
Alignment screen.
Actual alignment value will be displayed on alignment slider.
Press [Start] then move the slider to reach the desired value.
This value means the percentage of
charge when the radio starts the warning signals to the user (visual and acoustic).
As soon the desired value is
reached, press [Finish] to store the value on radio memory.
Default value is 10 which correspond to 10% of residual
charge to start the warning process.
If you want to retrieve factory default, press [Factory] instead of [Start]. You will be asked to confirm
the factory default alignment, and then if you confirm it, original values from factory will be loaded
into current alignment settings.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 25
7. COMPLIMENTARY USER ALIGNMENT
The above parameters only can be aligned under dealer login and most
of them should be critical for proper radio performance.
Additional complimentary parameters should be also aligned
on user login mode; it means the user can align it as per the most convenient way for particular radio
usage.
7.1. OPTION ALIGNMENT:
To access to the option alignment
menu, select Edit then Option form the main software toolbar:
As soon as you click on Options… the Options screen is popped up:
From this screen the user can adjust:
7.1.1. ANALOG Microphone gain:
It aligns microphone sensitivity.
Alignment step is 3.2dB. For noisy environments or when
voice encryption is used, we recommend keeping it as low as
possible. Press [OK] to store it in the file.
The value will be updated after the file is transferred to the radio.
7.1.2. ANALOG External Mic Gain:
It aligns microphone sensitivity.
Alignment step is 3.2dB.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 26
For noisy environments or when voice encryption is used, we
recommend keeping it as low as possible.
Press [OK] to store it in the file.
The value will be updated after the file is transferred to the radio.
7.1.3. ANALOG AGC
ST-2112 has an Automated Gain Control for analog microphone. This function adjusts the gain to
reach a dynamic gain value which makes the analog voice deviation be equivalent to the right deviation
produced by 50mV RMS on the microphone output, and the
selected target gain. If you want to use AGC, then you
must select the target equivalent gain on the Mic Gain then check the ACG Check Box.
For example, if you want a dynamic
gain which causes the same effect that a gain of 6.4dB when the voice on the microphone causes 50mV
RMS in the microphone output (standard voice at 4 inches away
from the microphone), or 0dB gain on the external microphone connection, then you must program
the Analog Gain at 6.4dB and check AGC as bellow:
Press [OK] to store it in the file.
The value will be updated after the
file is transferred to the radio.
7.1.4. DIGITAL AGC
ST-2112 has an Automated Gain Control for digital microphone. This
function adjusts the gain to reach a dynamic gain value which makes
the voice to be equivalent to the right voice digitally played back in the other end, produced by 50mV
RMS on the microphone output, and the selected target gain.
If you want to use AGC, then you must select the target equivalent
gain on the Mic Gain then check the Digital ACG Check Box.
For example, if you want a dynamic gain which causes the same effect that a gain of 15.0dB when the
voice on the microphone causes 50mV RMS in the microphone
output (standard voice at 4 inches away from the microphone), or 6.0dB gain on the external
microphone connection, then you must program the Digital Gain at
15.0dB and the external gain on 6.0dB, then check Digital AGC as bellow:
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 27
Press [OK] to store it in the file.
The value will be updated after the file is transferred to the radio.
7.1.5. MINIMUM VOLUME LEVEL:
This alignment lets the user to
ensure the speaker level should be audible, evenly when the volume
control potentiometer is fully closed counter clockwise.
Minimum volume level can be aligned up to 250 (max) step 1.
7.1.6. SQUELCH LEVEL:
ST-2112 supports individual
squelch alignment for any channel to be programmed individually on each frequency defined into the
frequency chart of each bank. On this way, the user can set a higher
threshold level for noisy channels and lower for clear channels.
Once programmed, if due to the proximity of the radio to a noisy environment the squelch level is not
high enough, the user can adjust a common reference for all the
channels in the radio by adjusting the general squelch level.
Option screen on the edit menu, lets you to program the default
squelch reference for all the channels. This value can be
adjusted on the fly for the user if the dealer program on squelch control key or navigating through the radio
menu. To set a desired squelch reference,
please select you desired squelch level form the list:
Press [OK] to store it in the file.
The value will be updated after the file is transferred to the radio.
7.1.7. DISABLE RF POWER
Use this box to check when you do not want to use the RF power
amplifier. It is commonly used for dealers to make a demonstration of
the radio features without interfering to any other existing user in the frequency or for
operation without antenna connected to the radio.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 28
To disable the RF power amplifier, check the box:
Press [OK] to store it in the file.
The value will be updated after the
file is transferred to the radio.
8. RADIO APPEARANCE ALIGNMENT
Radio appearance can be customized as per user
requirement. Select Edit then appearance from
radio top toolbars to access to the appearance screen:
A soon as Appearance option is selected, a new window will pop up:
8.1. DISPLAYS AND LEDS:
This screen lets you adjust the behavior of the display and keyboard backlight.
8.1.1. Auto backlight delay alignment:
The auto backlight mode, automatically set on power off status to the backlight, after any
event, to reduce the battery demand.
To change the value of the delay before the backlight is powered off;
please enter the quantity of desired seconds for it.
8.1.2. Power on Text:
Type here the text to show on the display when the radio is powered
on. This string is very convenient for
radio identification or dealer advertising at the time the radio is
powered on.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 29
The option to activate or deactivate
the power on text is disabled.
8.1.3. Leds:
Future version will allow the user to disable the function of Rx and TX
led. Some application, as security, sometime demands no lights on the radio.
8.2. Tones
Second folder on appearance screen
allows the user to adjust the tones which are played back in any event.
Tones can be changed by the dealer. Check Key PTT if you want to play
back a tone to acknowledge any time PTT key is pressed.
Check De-Key PTT if you want to
play back a tone to acknowledges any time PTT is released. Check Keypad if you want to play
back a tone to acknowledge any
time any keyboard key is pressed. Check Pre TOT if you want to play
back a tone to allert when time out
timer is close to expire (5 seconds ahead).
Check Rotary if you want to play
back a tone to acknowledges any time the rotary switch changes its position.
8.3. ANNUNCIATION
Third folder on appearance screen, allows the user to define if the radio
will play back any annunciation message for some important events,
as per the associated check box. Voice and language of the
annunciation events can be adjusted as per user request.
Please refer to appendix III to learn about it.
Check Bank if you want the radio
plays a concerning message back any time current bank has been
changed. Check Channel if you want the
radio plays a concerning message back any time current channel has been changed.
Check Squelch mode if you want
the radio plays a concerning
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 30
message back any time squelch function is changed.
Check Battery level if you want the
radio plays a concerning message back any time battery level is below the value programmed as Battery
Warning Level on alignment screen. Check Power if you want the radio
plays a concerning message back any time power level (high, med, low
or auto) has been changed. Check GPS if you want the radio
plays a concerning message back any time the GPS changes the
status: Powered on, Powered Off, Fix, etc. (only on those versions which includes GPS)
Check RSSI if you want the radio
plays a concerning message back
any time you ask for current RSSI.
Press OK once you finish the setting of all desired messages. This feature will be stored into the file
then it will be transferred to the radio at the time the file is uploaded to the radio.
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 31
This page left blank intentionally
9. ST-2112 SCHEMATIC
PAENA
CSRAM
Title
Size Document Number Rev
Date: Sheet of
DM-0911-15 F
RC-2112 R1.4 REF LAYOUT 1.4
D
1 1Friday , July 11, 2014
U10
BH7824
CTLR1
B_OUT2
B_IN3
SP_IN4
SP15VCC6GND7SP28
C44
1nF
C17310nF
F1 C2Q 3
C1751uF
+
C93
10uF 2K2
C1741uF
R141 6.8K
R10610K
R107
120K
D6DAN222
1
3
2
R4547K
5VAF
C1782.2uF
VOL
C179
1nF
J3
ROTARY
123456
PWR_FB
C176 100nF
C194
100pF
18V+5V
C23510nF
+
C231
10uFC24810nF
U16HT7218
Vin1
GN
D2
Sht3
Vout5
BP4
C249
1nF
R12610
C45
NC
C74
100nF
Q5DTC114EM
R12147K
C2231nF
R115 10K
C193
47pF
R9510K
R41
1K
C1601uF
C148
1nF
C981uF
R90
10K
PWR_TUNE
C119
100nF
C120
10uF
R963K3
C1581uF
C149
1nF
R91
10K
MOD2
R42
4K7
Y3
16Mhz
12
3 4
R7947
C192
47pF
C140100nF
t
RT133tk1
2
C169
1nF
3VD
PROCESSOR CLOCK
C5100nF
UPCK
C155
NC
J6
CON4
1234
C66
100nF
C89NC
150
220K
10
1uF
MOD1
MOD2
15pF
C191
47pF
R81 1K
R85 1K
C144
1nF
CLKADJ
CLKADJ
C2
58
100nF
CSFM
TP3
1
TP1
1
TP2
1
C1610
R9410K
R89
33KC156
100nF
SDASCL
3VA
C145
1nFC147
NC
3VD
10pF
SCLSDA
+7V +5V
C187
1nF
C190
100pF
C189
100pF
C188
1nF
10uF
BAR63
L18LCB1608-600
C186
1nF
C802.2uF
C12710nF
R3222K
C81NC
C184
1nF
5pF
U4
AT23DF321
CS1
SO2
WP3
GND4
SI5SCK6HOLD7VCC8
VBUS
3VD
R93 10K
R31100K
MOD1
C2241nF
J7
HEADER 2
12
U5
CMX-7141
SMOSI1
SSCK2
SMISO3
SCS4
BOOTEN15
BOOTEN26
DVSS7
IRQN8
VDEC9
GPIOA10
GPIOB11
SY
SC
LK
113
DV
SS
14
TX
EN
A15
DIS
C16
DIS
CF
B17
ALT
18
AL
TF
B19
MIC
FB
20
MIC
21
AV
SS
22
MO
D1
23
MO
D2
24
VBIAS25AUDIO26ADC127ADC228ADC329ADC430AVDD31DAC132DAC233AVSS34DAC335DAC436D
VS
S37
VD
EC
38
XT
AL
/CL
K39
XT
AL
N40
DV
DD
41
MO
SI
42
MIS
O43
SS
OU
T44
DV
SS
45
SC
K46
SY
SC
LK
247
CS
N48
AGND49
U6
CMX-618
AVDD1
AVSS2
BIAS3
VSSREF4
INPP5
INPN6
AVDD7
AVSS8
VSSPA9
OUTP10
OUTN11
VDDPA12
VD
D13
IOV
DD
14
EC
DI
15
EC
DO
16
EC
CL
K17
EC
CS
18
EE
C19
RE
SC
20
NC
21
VS
S22
CS
EL
23
IOV
DD
24
SYNC25VSS26XTALIN27XTALOUT28IOVDD29RESETC30XTALSEL131XTALSEL232XTALSEL333ENABXTAL34IOVDD35NC36
NC
37
NC
38
NC
39
NC
40
VS
S41
SC
LK
42
SM
OS
I43
SM
ISO
44
CS
C45
IRQ
C46
IOV
DD
47
VD
D48
AGND49
RADIO CLOCK
R4 NC
GPSRXGPSTX
POWER CONTROL
SCK
MISOMOSI
R14 1K
C64
100nF
IRQA
R58 1K
AUDIO
GPSTX
3VA
C65
1nF
ROW3
TX POWER SUPPLY
C49
5pF
ROW2ROW1
NAVGPSRX
C106
10uF
C105
10uF
10pF
Y2
TXCO19.2M
12
3 4
R4047
C99100nF
C47
100nF
C48
1nF
Q4DTA114EM
R1371K
C206
1nF
C207
1nF
C210
1nF
C211
1nF
C208
1nF
C209
1nF
C212
1nF
13nH
C76NC
C2161nF
L1547nH
82pF
PWCTRL
L9
27nH
R52 1K
C50
NC
R15 1K
CSR
RDA POWER SUPPLY
C88
1nF
C97
1nF
R39100
R44100
3VD
XC2
XC1
XC2
XC1
CODEC
C213
1nF
C214
1nF
D3BAR63
C215
1nF
PROGRAMMING
27nH
0
15nH 15nH
13nH 13nH 13nH
13nH
150pF
150
47pF
R68 22
R70 22
UPCK
22
R55
10K
3VD
CSD
VBAT
SUBFNC
D0
D2D1
D4D3
D5D6
2pF
U18XC6201
VIN3
VOUT1
GN
D2
D7GPS
SCK
MISOMOSI
+
C198
10uF
C1831uF
SCK
MOSIMISO
7pF
10pF
33pF
C25
1nFC51
NC R25560
U8
AT90USB
BIAS1
SMTK2
NC13
UDP4
UDM5
UVSS6
UCAP7
VBUS8
UID9
TX_LED10
SCK11
MOSI12
MISO13
SPEECH14
IRQVOC15
C3VR16
IRQ
N17
GP
S18
RE
SE
T20
VC
C1
21
GN
D1
22
NC
223
SY
SC
LK
24
SC
L25
SD
A26
RX
D27
TX
D28
RS
WA
29
RS
WB
30
RS
WC
31
RS
WD
32
EXTPTT33IRQR34CSFM35CSRAM36CSR37CSD38CSA39CSN40CBL41SUBD42RX_LED43D744D645D546D447D348
D2
49
D1
50
D0
51
VC
C2
52
GN
D2
53
SID
E54
VB
AT
55
FM
IC56
RO
W1
57
RO
W2
58
RO
W3
59
FN
C60
NA
V61
AV
CC
162
AG
ND
63
AV
CC
264
CH
R19
GND65
13nH
R222K2
Q22SC33563
21
R111 1K
BAT
U11
MIC2290
IN2
EN3
GN
D4
GN
D8
SW7
OUT1
FB6
NC5
HS
9
L17
10uH
+
C181
10uF
R2622C52
150p
6.8pF
R108
33KR1103K3 +C182
10uF
RESET
R92 10K
C136
4.7uF
VCTRL
3VD
TEMP
D5
RR264M
RESET
MOSI
SCKMISO
VBUS
UDP
UDM
UID
UVSS
150pF
C2010nF
CBL
L547nH
P1
TEST 1
11
R16470
MAIN CLOCK
15pF
C14
150pF
R1210
TX5V
DET
C26100pF
C338pF
C67
NC
CSA
150pF
220K
C62
100pF
L16NC
L14
0
C34**
L10
0
D4HSM88AS
3
1 2
AUDIO
SIDE
SDA
C40
1nF
IRQA
BAR63
C168
10uF
C167
100nF
RXD
C219
100pF
TX5V
NAV
JP2
CONN18X2
11
22
33
44
55
66
77
88
99
1010
1111
1212
1313
1414
1515
1616
1717
1818
191920202121222223232424252526262727282829293030313132323333343435353636
U2
MCP6241U
Vin+1
VSS2
Vin-3 Vout
4
VDD5
R4382K
C9010nF
R34120K
C8310nF
TP9
1
R35470K
P4
HEADER 1
11
P5
HEADER 1
11
P6
HEADER 1
11
P7
HEADER 1
11
P8
HEADER 1
11
P9
HEADER 1
11
P10
HEADER 1
11
P11
HEADER 1
11
MOD1
MOD2
R1747
VOL
AUDIO
OUTP
RV110k
3 1
24 5
R1847K
C61
0
DET
MOUT
PWR_TUNE
3VD
PWFB
C123
100nF
C124
10uF
C22210nF
18VP12
HEADER 1
11
P13
HEADER 1
11
P14
HEADER 1
11
3VA
C138
10nF
C220
100pF
C1610nF
C15
150pF
R83 4K7
3VD
PWR_TUNE
R1310K
Q32SK34751
32
+7V
+
C257
22uF
P17
HEADER 1
11
P15
HEADER 1
11
P16
HEADER 1
11
3VD
3VR
3VD
L627nH
5VAF
+5V
C211nF
+7V
C77NC
L2BEAD
12
C153
100nF
C154
1nF
C4
10nF
C3
1nF
3VD
R72 330
RADIO
C103
1nF
3VR
13nH
TXLED
RXLED
D8LTST-C195KGJRKT
2 4
1 3
3VR
PINK VALUES CORRESPOND TO ST-2112C
+C6310uF
C29NC
C2468pF
R76 330 P18
HEADER 1
11
+
C82
22uF
100pF
100pF
47pF
1uF
7pF 22pF0.5pF 0.5pF
150pF
6.8pF
C118
1nF
L8
0
C117
100nF
C35
**
TP7
1
C36
**
TP8
1
TP5
1
TP6
1
C37
15pF
TP4
1
C38
56pF
R23470
SPEECH
C191nF
Q12SK3476
1
32
22pF
10
R8710K
SMTK
C43
NC
C41
NC
C42
NC
18V
15nH
C46
NC
R984K7
CSA
C141
1uF
C116
1nF
C115
100nF
R2147
C171uF
J8
HEADER 2
12
C18150pF
27pF
3VA
FNCROW3
ROW1ROW2
C135
100nF
R1910K
R1010K
PWR_TUNE
PWFB
R1147K
TEMP
C139
NC
L427nH
L1LCB1608-600
12
+7V
C134
100nF
3VD
C13
1nF
C12470pF
C1
150pF
Y1
12.8Mhz
12
3 4
+
C2
10uF
R100 1K
C841nF
CSN
C162
1nF
GREEN VALUES CORRESPOND TO ST-2112V
IRQR
C2301nF
SCL
R133 10K
CHR
MICP
MICN
5pF
7pF
C163
1nF
CBL
C128
1nF
C146
NC
R62
10K
R104
0.2
BATCHR
R86 1K
VBUS
R97 1K
100pF
3VR+5V
OUTP
C23310nF
C164
1nF
+
C227
10uF
OUTP
R1242.2
U14HT7233
Vin1
GN
D2
Sht3
Vout5
BP4
+
C228
10uF
SMTK
C137
100nF
C129
1nF
R82
10k
C180
100pF
J9
HEADER 2
12
C170
NC
18V
C87
NC
C150
100nF
C165
1nF
SMARTRUNK SYSTEMS, INC
C130
1nF
VCTRL
R91K
27pF
ACCESORY
LEDS
MAIN POWER SUPPLY AUDIO POWER SUPPLY
EXT PTT
PROCESSOR POWER SUPPLY
MICROPHONE
ANALOG POWER SUPPLY CODEC POWER SUPPLY
BATTERY
BATTERY CHARGER
MEMORIES
C152
100nF
R13110
MAIN PROCESSOR
C255
10uF
C256
10uF
R129 6.8K
13nH
C131
1nF
R11747
J1
Antenna
12345
6.8pF
0.5pF
C5VT
3VD
AUDIO PA
150pF
R132 10
C1421nF
MICN
+5V
R27
2M2
+7V
C171NC
+
C2361uF
R1272.2
U17XC6201
VIN3
VOUT1
GN
D2 +
C23710uF
L7
3.3nH
CSRAMCSFM
C78150pF
R29100
J2
USB
1234567
CSR
C32
1nF
C30
1pF
CSN
R80 0
C5515pF
R30100K
R78 0
C5818pF
PWFB
C31
1pF
R73 0
R28100
R77 0
L13
22nH
R75 0
C595pF
R74 1K
R61
10K
R66 1K
R71 1K
R59
10K
R69 1K
R60
10K
R67 1K
R65 1K
R63
10K
3VD
R7 1K
R5 1K
R6 1K
C143NC
PAENA
D7
RB886
IRQN
IRQR
+7V
R1282.2
PWR_FB
3VD
R54 1KR53 1KR51 1K
C121
1nF
R11910K
R11422K
VINT
R112100K
C23
1nF
MODEM
2.4pF 2pF
15pF
TX5V
R8100
C8
470pFL3.82uH
3VD
L12
22nH
C5727pF
C5412pF
MISOSCKMOSI
0.5pF
VBUS
15nH
3VD
MISO
U7
23K640
CS1
SO2
WP3
GND4
SI5SCK6HOLD7VCC8
SCKMOSI
C151
100nF
R138100
SPEECH
DET
22
3VR
C7
1nF
L11
22nH
C5639pF
C110
1nF
C2782pF
D1
BAR88
R139100K
FMIC
22uF
FMIC
MICPC159 1uF
MOUT
EXTK
C244
1nFC247
1nF
EXTK
3VD
R113470
R1164K7
C111
1nF
D9
RB886
C1854.7uF
C199
100pF
U1
RDA1846
AVDD11
SCK2
MOSI3
AVDD24
XTAL15
XTAL26
MODE7
CSR8
AF
O9
NC
110
MIC
11
CC
12
AV
DD
313
NC
214
RF
IN15
AV
DD
416
NC317RFOUT18NC419NC520AVDD521PABIAS22AVDD623PDN24
IO7
25
IO6
26
IO5
27
IO4
28
MIS
O29
INT
30
SU
BD
31
SU
B32
GND33
C100100nF
R56
10K
C112
1nF
IRQVOC
MISO
CSVOC
MOSISCK
C2261nF
SCK
15pF15pF
CSVOC
C5310pF
C2
41
1nF
IRQVOC
MOSI
C232
1nF
C200
100pF
TXLED
RXLED
C113
1nFR57 22K
R64 1K
27nH
C201
1nF
2K2
C240
10nF
C202
1nFR120100K
C73
1nF
C72
100nF
C3VR
MOUT
2.4pF
C3VR
C60
0
3VD
+5V
LS1
SPEAKER
C68150pF
C25110nF
+
C243
10uF
C254
100nFC
25
31nF
R1302.2
U19HT7233
Vin1
GN
D2
Sht3
Vout5
BP4
TXD
C25210nF
TXD
U3HT7250
Vin1
GN
D2
Sht3
Vout5
BP4
TX5V
C177100nF
C166
100pF
C203
1nF
C9410nF
JP1
PROG
1234567
R372.2
R134
2K2
R135
1K
+7V
VINT
+
C91
10uF
R140 10K
EXTPTT
CSD
GPS
C10110nF
C5VT
J4
3.5mm
12345
+
C2381uF
C71
1nF
C70
1nF
R2
10
3VA
SW4SW KEY-YM061
12345678
R136
4K7
SIDE
+5V
C204
1nF
+C9510uF
C23410nF
+
C229
10uF
PWCTRL
U15HT7233
Vin1
GN
D2
Sht3
Vout5
BP4
C246
1nF
R1252.2
R105 22k
C24510nF
R109 22k
C11
1nF
J5
TG-2915
12345
C9610nF
C10
100nF
SIDE UP
PTT
R33100
SIDE DOWN
EMERGENCY
C126
100nF
C125
NC
SUB
5VAF
C205
1nF
VBATR122
33K
+
C23910uF
R12347K
C122
1nF
RCLK
RCLK
+
C86
10uF
TX5V
R36
56K
0
RXD
3VD
MK1
MIC
12
C2171uF
C8510nF
TX5V
D1D0
D2
R4647K
D3D4
C102
10nF
REFERENCES
IF COMPONENT IS DIFERENT BETWEEN THE DIFERENTMODELS, THEN YOU WILL FIND THREE VALUES UNDER THE COMPONENT.BLUE VALUES CORRESPOND TO ST-2112V
D5
D7D6
IRQN
C133
1nF
C2
50
1nF
150pF
5pF
R3822K
R1181K
R50
10K
C157 1uF
EXTPTT
C242
10uF
C13210uF
3VA
U12
MCP6241U
Vin+1
VSS2
Vin-3Vout
4
VDD5
C114
1nF
C2214.7uF
10. ST-2112 FROM BOARD SCHEMATIC
CSA
SCK
U4
LIS302
VDDIO1
GND2
VDD3
GND4
GND5
VDD6
CS7
INT18
INT29
GND10
GND11
MISO12
MOSI13
SCK14
CBL
3VD
C21
104
R43
220
3VD 3VA+5V+7V
D5
D3
D7
D1
JP1
HEADER 18X2
123456789101112131415161718 19
2021222324252627282930313233343536
GPSRX
IRQA
MOSISCK
GPSTX
ROW3
D4
MISO
ROW1ROW2
D5
D1
CSD
GPS
D6
D2
CSANAV
D3
FNCSDASCL
CBL
D7
D0
TP3
1
TP2
1
TP1
1
R3410
C28105
CSDD5
SCKD6
MOSI
3VD
C29 225
D0
D1
D2
MOSI
MISO
IRQA
SDA
SCL
+7V
J1
CON8
12345678
C30 225
C31
334R42NC
VBL
F1
NC
R31K
R41K
R51K
R61K
D3
R38 27K
R4122K
VBL
ROW3ROW2ROW1
NAV
SW1
1234
SW9
1234
SW8
1234
SW3
1234
SW2
1234
SW14
1234
SW13
1234
SW12
1234
SW10
1234
SW17
1234
SW15
1234SW19
1234
SW18
1234
TP6
1
SW16
1234
SW20
1234
SW11
1234
R39
2K2
R35
1k
R29
2k2
R21
4k7
R40
1k
R33
4K7
R36
1k
R30
2k2
R22
4k7
R37
1k
R31
2k2
R23
4k7R24
1K
R200
R190
R7NC
D4
R10NC
D7
D2R8330
C11
102
+5VR910
C8103
+
C7
106C10104
U2HT7233
Vin1
GN
D2
Sht3
Vout5
BP4
TP4
1
SW7
1234
SW6
1234
SW5
1234
SW4
1234
R27
1k
R26
2k2
R25
4k7FNC
ACCESY PORT POWER SUPPLY
U1
PEB-916
AN
T1
AG
ND
12
AG
ND
23
AG
ND
34
VB
AT
5
GN
D1
6
NC
7
AG
ND
48
AG
ND
59
AG
ND
610
VC
C11
AGND712NRES13AGND814GND215NC16AGND917NC18A
GN
D1
019
1P
PS
20
AG
ND
11
21
AG
ND
12
22
AG
ND
13
23
GN
D24
NC
25
AG
ND
14
26
NC
27
AG
ND
15
28
AG
ND
16
29
TX030
RX131
NC32
GND33
NC34
AGND1735
AGND1836
F2
200mA
C32
104
SMARTRUNK SYSTEMS, INC
+
C2
106
JP2
HEADER 14
123456789
1011121314
U5
MIMD10A
E2N1
B2N2
C1P3
E1P4B1P5C2N6
VBL
Title
Size Document Number Rev
Date: Sheet of
DM-1001-111026 C
ST-2112 - FRONT BOARD
B
1 1Wednesday , August 29, 2012
F2F1 F4F3
UP
RIGHTLEFT
GPSTXGPSRX
R2
4K7
+7V
C1NC
C12103
+
C9
106
+5V
C14
102C13104
U3HT7233
Vin1
GN
D2
Sht3
Vout5
BP4
R1110
D8
D4
R17330
R12330
R15330
D6GPS
3VD
C48PF
L1
ANT
R11K
6MNO5JKL4GHI
*
9WXYZ8TUV7PQRS
2ABC1
#0
3DEF
TP5
1
11 ST-2112 COMPONENT LOCATOR (TOP LAYER)
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 35
12 ST-2112 COMPONENT LOCATOR (BOTTOM LAYER)
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 36
13 ST-2112 PCB TOP LAYER
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 37
14 ST-2112 PCB BOTTOM LAYER
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 38
15 ST-2112 PCB GROUND LAYER
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 39
16 ST-2112 PCB POWER LAYER
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 40
17 ST-2112 FRONT BOARD COMPONENT LOCATOR (TOP LAYER)
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 41
18 ST-2112 FRONT BOARD COMPONENT LOCATOR (BOTTOM LAYER)
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 42
19 ST-2112D BOM
NAME DESCRIPTION VALUE RANGER PN
MAIN PCB EPL211010D
C1 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C14 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C15 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C18 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C68 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C78 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C12 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C21 CAP CER 150PF 50V C0G 0402 150pF CK1151AK5A
C95 CAP TANT 10UF 10V 10% 1206 10uF CTY101066ZR
C2 CAP TANT 10UF 10V 10% 1206 10uF CTY101066ZR
C91 CAP TANT 10UF 10V 10% 1206 10uF CTY101066ZR
C182 CAP TANT 10UF 10V 10% 1206 10uF CTY101066ZR
C237 CAP TANT 10UF 10V 10% 1206 10uF CTY101066ZR
C239 CAP TANT 10UF 10V 10% 1206 10uF CTY101066ZR
C181 CAP CER 10UF 10V Y5V 0805 10uF CK0106AB7R
C63 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C86 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C93 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C105 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C132 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C198 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C227 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C228 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C229 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C231 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C242 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C243 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C255 CAP CER 10UF 6.3V X5R 20% 0603 10uF CK6106AD6T
C136 CAP CER 4.7UF 6.3V 20% X5R 0402 4.7uF CK6475AK6T
C185 CAP CER 4.7UF 6.3V 20% X5R 0402 4.7uF CK6475AK6T
C221 CAP CER 4.7UF 6.3V 20% X5R 0402 4.7uF CK6475AK6T
C19 CAP CER 1000PF 50V 0603 LOW DIST 1nF CK1102AD5XR
C3 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C7 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C11 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C13 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C40 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 43
C48 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C65 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C70 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C71 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C73 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C84 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C88 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C97 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C103 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C110 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C111 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C112 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C113 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C114 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C116 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C118 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C121 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C122 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C128 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C129 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C130 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C131 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C133 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C142 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C144 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C145 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C148 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C149 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C154 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C162 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C163 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C164 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C165 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C169 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C179 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C184 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C186 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C187 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C188 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C201 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C202 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 44
C203 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C204 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C205 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C206 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C207 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C208 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C209 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C210 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C211 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C212 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C213 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C214 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C215 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C216 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C223 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C224 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C226 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C230 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C232 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C241 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C244 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C246 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C247 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C249 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C253 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C44 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C250 CAP 1000PF 50V CERAMIC X7R 0402 1nF CK1102AK5X
C166 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C180 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C189 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C190 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C194 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C199 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C200 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C219 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C220 CAP CERAMIC 100PF 50V NP0 0402 100pF CK1101AK5A
C26 CAP CERAMIC 22PF 50V NP0 0402 22pF CK1220AK4A
C23 CAP CER 100PF 100V 10% NP0 0603 100pF CK4101AD5A
C32 CAP CER 150PF 100V 10% NP0 0603 150pF CK4151AD4A
C8 CAP CERAMIC 47PF 50V NP0 0402 470pF CK1471AK4A
C4 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 45
C20 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C83 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C85 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C90 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C94 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C96 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C101 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C102 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C127 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C138 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C173 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C222 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C233 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C234 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C235 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C240 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C245 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C248 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C251 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C252 CAP CERAMIC .01UF 50V X7R 0402 10nF CK5103AK5X
C5 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C10 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C47 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C64 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C66 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C72 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C74 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C99 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C115 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C117 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C119 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C123 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C126 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C134 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C135 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C137 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C140 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C150 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C151 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C152 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C153 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 46
C156 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C167 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C176 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C177 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C100 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C258 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C254 CAP .10UF 16V CERAMIC Y5V 0402 100nF CK5104AK5X
C16 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C17 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C98 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C141 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C157 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C158 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C159 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C160 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C174 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C175 CAP CER 1.0UF 6.3V X5R 20% 0402 1uF CK6105AK6T
C236 CAP CERAMIC 1UF 16V Y5V 0603 1uF CK5105AD7RR
C238 CAP CERAMIC 1UF 16V Y5V 0603 1uF CK5105AD7RR
C24 CAP CER 82PF 50V 5% NP0 0603 82pF CK1820AD4AR
C56 CAP CER 6.8PF 50V 5% NP0 0603 6.8pF CK9689AD4A
C59 CAP CER 6.8PF 50V 5% NP0 0603 6.8pF CK9689AD4A
C25 CAP CER 7PF 50V NP0 0402 7pF CK1070AK2A
C33 CAP CER 8PF 50V NP0 0402 8pF CK1080AK2A
C30 CAP CERAMIC 0.5PF 50V C0G 0402 .5pF CK1059AK1A
C31 CAP CERAMIC 0.5PF 50V C0G 0402 .5pF CK1059AK1A
C46 CAP CER 15PF 250V 10% SMD 0603 15pF CK9150AD4A
C37 CAP CER 15PF 50V SMD 0603 15pF CK1150AD4A
C55 CAP CERAMIC 2PF 100V NPO 0603 2pF CK4020AD1A
C54 CAP CERAMIC 2.4PF 100V NPO 0603 2.4pF CK4249AD1A
C58 CAP CER 5PF 250V C0G SMD 5pF CK9050AD1A
C57 CAP CER 5PF 250V C0G SMD 5pF CK9050AD1A
C42 CAP CER 27PF 250V SMD 0603 27pF CK9270AD4A
C82 CAP CER 22UF 6.3V 20% X5R 0603 22uF CK6226AD6T
C257 CAP CER 22UF 6.3V 20% X5R 0603 22uF CK6226AD6T
C178 CAP CER 2.2UF 16V Y5V 0603 2.2uF CK5225AD7R
C80 CAP CER 2.2UF 4.0V X5R 20% 0402 2.2uF CK6225AK6T
C41 CAP CER 10PF 50V NPO SMD 0603 10pF CK1100AD4A
C24 CAP CER 47PF 50V 1% NP0 0603 47pF CK1470AD4A
C191 CAP CER 47PF 50V 1% NP0 0402 47pF CK1470AK4A
C192 CAP CER 47PF 50V 1% NP0 0402 47pF CK1470AK4A
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 47
C193 CAP CER 47PF 50V 1% NP0 0402 47pF CK1470AK4A
C62 CAP CER 47PF 50V 1% NP0 0402 47pF CK1470AK4A
C38 CAP CER 56PF 50V 1% NP0 0603 56pF CK1560AD4A
C183 CAP CER 1UF 16V Z Y5V 0402 1uF CK5105AK7R
C217 CAP CER 1UF 16V Z Y5V 0402 1uF CK5105AK7R
C106 CAP CER 10UF 6.3V 20% X5R 0402 10uF CKC106AK6T
C120 CAP CER 10UF 6.3V 20% X5R 0402 10uF CKC106AK6T
C124 CAP CER 10UF 6.3V 20% X5R 0402 10uF CKC106AK6T
C168 CAP CER 10UF 6.3V 20% X5R 0402 10uF CKC106AK6T
C257 CAP CER 10UF 6.3V 20% X5R 0402 10uF CKC106AK6T
D3 DIODE RF SGL 50V 100MA SOD-323 BAR63 EDBAR0063Y
D1 DIODE RF SGL 50V 100MA SOD-323 BAR63 EDBAR0063Y
D7 DIODE RB886CS EDRB886CSY
D9 DIODE RB886CS EDRB886CSY
D4 SILICON SCHOTTKY BARRIER DIODE HSM88AS EDHSM0088A
D5 DIODE 400V 0.7A SOD-123 RR264M EDRR00264M
D6 DIODE SWITCH 80V 100MA EMD3 DAN222 EDDAN0222Y
D8 LED GREEN/RED BICOLOR 0606 SMD LTST-
C195KGJRKT EX01Y40203
F1 FUSE 3A 32V 0603 FAST C2Q C2Q 3 EX02Y40258
J2 CONN RCPT MINI USB2.0 5POS USB EX07N49886
J6 BATTERY CONNCETOR RIGHT ANGLE CON4 EX07Y49885
L2 BEAD COIL BEAD YCBAD18592
L18 BEAD COIL BEAD YCBAD18592
L1 BEAD COIL BEAD YCBAD18592
L3 CHOKE COIL .82uH YCMCI8243D
L4 SPRING COIL 27nH YCSPG18424
L9 CHOKE COIL 15nH YCMCI1533D
L10 CHOKE COIL 15nH YCMCI1533D
L6 CHOKE COIL 27nH YCMCI2733D
L5 CHOKE COIL 27nH YCMCI2733D
L8 RES 0.0 OHM 1/10W JUMP 0603 0 RCY060004ZR
L14 RES 0.0 OHM 1/10W JUMP 0603 0 RCY060004ZR
L7 RES 0.0 OHM 1/10W JUMP 0603 0 RCY060004ZR
L15 CHOKE COIL 47nH YCWCI4733B
L11 Fixed Inductors Air Core RF Inductor 13.7 nH 5 % 2.7 A 13nH YCSPG18426
L12 Fixed Inductors Air Core RF Inductor 13.7 nH 5 % 2.7 A 13nH YCSPG18426
L13 Fixed Inductors Air Core RF Inductor 13.7 nH 5 % 2.7 A 13nH YCSPG18426
L15 Fixed Inductors Air Core RF Inductor 13.7 nH 5 % 2.7 A 13nH YCSPG18426
L17 INDUCTOR 10UH 500-MA 0603 10uH YCTLI1064C
Q1 TR 2SK3476 TY2SK3476Z
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 48
Q2 TRANSISTOR NPN 1GHZ SOT-23 2SC3356 TY2SC3356Z
Q3 TR 2SK3475 TY2SK3475Z
Q4 TRANS PREBIAS PNP 150MW VMT3 DTA114EM TYDTA114EM
RT1 THERMISTOR 33K OHM NTC 0402 SMD 33tk RTU143334Y
R10 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R19 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R50 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R55 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R59 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R60 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R61 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R62 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R63 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R82 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R87 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R90 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R91 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R92 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R93 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R94 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R95 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R106 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R115 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R119 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R133 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R140 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R13 RES 10K OHM 1/16W 5% 0402 SMD 10K RCY041034Z
R141 RES 6.8K OHM 1/16W 5% 0402 SMD 6.8K RCY046824Z
R129 RES 6.8K OHM 1/16W 5% 0402 SMD 6.8K RCY046824Z
R5 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R6 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R7 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R9 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R14 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R15 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R51 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R52 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R53 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R54 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R58 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R64 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 49
R65 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R66 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R67 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R69 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R71 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R74 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R81 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R85 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R86 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R97 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R100 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R111 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R118 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R135 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R137 RES 1.0K OHM 1/16W 5% 0402 SMD 1K RCY041024Z
R73 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
R75 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
R77 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
R78 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
R80 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
C60 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
C61 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
C161 RES 0.0 OHM 1/16W 0402 SMD 0 RCY040004Z
R8 RES 100 OHM 1/16W 5% 0402 SMD 100 RCY041014Z
R28 RES 100 OHM 1/16W 5% 0402 SMD 100 RCY041014Z
R29 RES 100 OHM 1/16W 5% 0402 SMD 100 RCY041014Z
R33 RES 100 OHM 1/16W 5% 0402 SMD 100 RCY041014Z
R39 RES 100 OHM 1/16W 5% 0402 SMD 100 RCY041014Z
R44 RES 100 OHM 1/16W 5% 0402 SMD 100 RCY041014Z
R138 RES 100 OHM 1/16W 5% 0402 SMD 100 RCY041014Z
R11 RES 47K OHM 1/16W 5% 0402 SMD 47K RCY044734Z
R18 RES 47K OHM 1/16W 5% 0402 SMD 47K RCY044734Z
R45 RES 47K OHM 1/16W 5% 0402 SMD 47K RCY044734Z
R46 RES 47K OHM 1/16W 5% 0402 SMD 47K RCY044734Z
R121 RES 47K OHM 1/16W 5% 0402 SMD 47K RCY044734Z
R123 RES 47K OHM 1/16W 5% 0402 SMD 47K RCY044734Z
R12 RES 22 OHM 1/16W 5% 0402 SMD 22 RCY042204Z
R26 RES 22 OHM 1/16W 5% 0402 SMD 22 RCY042204Z
R68 RES 22 OHM 1/16W 5% 0402 SMD 22 RCY042204Z
R70 RES 22 OHM 1/16W 5% 0402 SMD 22 RCY042204Z
R32 RES 22K OHM 1/16W 5% 0402 SMD 22K RCY042234Z
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 50
R38 RES 22K OHM 1/16W 5% 0402 SMD 22K RCY042234Z
R57 RES 22K OHM 1/16W 5% 0402 SMD 22K RCY042234Z
R105 RES 22K OHM 1/16W 5% 0402 SMD 22K RCY042234Z
R109 RES 22K OHM 1/16W 5% 0402 SMD 22K RCY042234Z
R114 RES 22K OHM 1/16W 5% 0402 SMD 22K RCY042234Z
R16 RES 470 OHM 1/16W 5% 0402 SMD 470 RCY044714Z
R113 RES 470 OHM 1/16W 5% 0402 SMD 470 RCY044714Z
R17 RES 47 OHM 1/16W 5% 0402 SMD 47 RCY044704Z
R21 RES 47 OHM 1/16W 5% 0402 SMD 47 RCY044704Z
R40 RES 47 OHM 1/16W 5% 0402 SMD 47 RCY044704Z
R79 RES 47 OHM 1/16W 5% 0402 SMD 47 RCY044704Z
R117 RES 47 OHM 1/16W 5% 0402 SMD 47 RCY044704Z
R22 RES 2.2K OHM 1/16W 5% 0402 SMD 2K2 RCY042224Z
R41 RES 2.2K OHM 1/16W 5% 0402 SMD 2K2 RCY042224Z
R134 RES 2.2K OHM 1/16W 5% 0402 SMD 2K2 RCY042224Z
R23 RES 150 OHM 1/10W 5% 0603 SMD 150 RCY061514Z
R25 RES 560 OHM 1/16W 5% 0402 SMD 560 RCY045614Z
R27 RES 2.2M OHM 1/10W 5% 0603 SMD 2M2 RCY062254Z
R30 RES 100K OHM 1/16W 5% 0402 SMD 100K RCY041044Z
R31 RES 100K OHM 1/16W 5% 0402 SMD 100K RCY041044Z
R112 RES 100K OHM 1/16W 5% 0402 SMD 100K RCY041044Z
R120 RES 100K OHM 1/16W 5% 0402 SMD 100K RCY041044Z
R139 RES 100K OHM 1/16W 5% 0402 SMD 100K RCY041044Z
R34 RES 120K OHM 1/16W 5% 0402 SMD 120K RCY041244Z
R107 RES 220K OHM 1/16W 5% 0402 SMD 220K RCY042244Z
R35 RES 470K OHM 1/16W 5% 0402 SMD 470K RCY044744Z
R36 RES 56K OHM 1/16W 5% 0402 SMD 56K RCY045634Z
R37 RES 10 OHM 1/16W 5% 0402 SMD 10 RCY041004Z
R2 RES 10 OHM 1/16W 5% 0402 SMD 10 RCY041004Z
R126 RES 10 OHM 1/16W 5% 0402 SMD 10 RCY041004Z
R131 RES 10 OHM 1/16W 5% 0402 SMD 10 RCY041004Z
R132 RES 10 OHM 1/16W 5% 0402 SMD 10 RCY041004Z
R127 RES 2.2 OHM 1/16W 5% 0603 SMD 2.2 RCY062294Z
R42 RES 4.7K OHM 1/16W 5% 0402 SMD 4K7 RCY044724Z
R83 RES 4.7K OHM 1/16W 5% 0402 SMD 4K7 RCY044724Z
R98 RES 4.7K OHM 1/16W 5% 0402 SMD 4K7 RCY044724Z
R116 RES 4.7K OHM 1/16W 5% 0402 SMD 4K7 RCY044724Z
R136 RES 4.7K OHM 1/16W 5% 0402 SMD 4K7 RCY044724Z
R43 RES 82K OHM 1/16W 5% 0402 SMD 82K RCY048234Z
R76 RES 330 OHM 1/16W 5% 0402 SMD 330 RCY043314Z
R72 RES 330 OHM 1/16W 5% 0402 SMD 330 RCY043314Z
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 51
R104 RES .20 OHM 1/8W 5% 0805 0.2 RCY010294Z
R89 RES 33K OHM 1/16W 5% 0402 SMD 33K RCY043334Z
R108 RES 33K OHM 1/16W 5% 0402 SMD 33K RCY043334Z
R122 RES 33K OHM 1/16W 5% 0402 SMD 33K RCY043334Z
R96 RES 3.3K OHM 1/16W 5% 0402 SMD 3K3 RCY043324Z
R110 RES 3.3K OHM 1/16W 5% 0402 SMD 3K3 RCY043324Z
R124 RES 2.2 OHM 1/16W 5% 0402 SMD 2.2 RCY042294Z
R125 RES 2.2 OHM 1/16W 5% 0402 SMD 2.2 RCY042294Z
R128 RES 2.2 OHM 1/16W 5% 0402 SMD 2.2 RCY042294Z
R130 RES 2.2 OHM 1/16W 5% 0402 SMD 2.2 RCY042294Z
SW4 PUSH SWITCH SMD SW KEY-YM061
EWPS33083X
U1 SINGLE CHIP RADIO TRANSCEIVER RDA1846 YNRD01846Z
U2 IC OPAMP SNGL 1.8V R-R SC70-5 MCP6241U YNMR6241UT
U12 IC OPAMP SNGL 1.8V R-R SC70-5 MCP6241U YNMR6241UT
U3 IC REG LDO 5.0V .3A SOT23-5 HT7250 YNHT07250Z
U5 dPMR MODEM IC CMX-7141 YNCM07141Q
U6 VOCODER IC CMX-618 YNCM00618Q
U7 IC SRL SRAM 64K 3.6V 8-TSSOP 23K640 YNMR23K640
U8 IC AVR MCU 64K 64QFN AT90USB YNAT1286MU
U10 IC AMP HDPH/SPEAKER UNBAL 8MSOP BH7824 YNRO07824Z
U11 IC REG BOOST ADJ 0.5A 8MLF MIC2290 YNML02290Z
U16 LDO LINEAR REGULATOR 1.8V 300mA HT7218 YNHT07218Z
U18 IC REG LDO 5V 0.2A SOT89-3 XC6201 YNTX1P502P
U17 IC REG LDO 5V 0.2A SOT89-3 XC6201 YNTX1P502P
Y2 TCXO 19.2MHZ 3.3V TCXO/+-0.5PPM TXCO19.2M EFO192000Y
JP2 BOARD TO BOARD 18X2 CONN CONN18X2 EX07Y49871
Q5 NPN PRE BIASED TRANSISTOR DTC114EM TYDTC114EM
U4 FLASH MEMORY 32MBIT AT23DF321 YNAT25321A
Y1 VC-TXCO 12.8Mhz 3V +-12/2PPM VC-TXCO EFO128000Y
U14 LDO LINEAR REGULATOR 3.3V 300mA HT7233 YNHT07233Z
U15 LDO LINEAR REGULATOR 3.3V 300mA HT7233 YNHT07233Z
U19 LDO LINEAR REGULATOR 3.3V 300mA HT7233 YNHT07233Z
Y3 TCXO 16MHZ 3.3V TCXO/+-0.5PPM CRYSTRAL
16Mhz EFO160000Y
20 ST-2112 KEYBOARD & DISPLAY BOM
ITEM QTY DESCRIPTION SMTK PN
1 1 KEY PCB EPL211030Z
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 52
2 2 RESISTOR 0 ohm (0402) RCY040004Z
3 1 RESISTOR 10 ohm (0402) RCY041004Z
4 4 RESISTOR 330 ohm (0402) RCY043314Z
5 1 RESISTOR 200 ohm (0402) RCY042014Z
6 9 RESISTOR 1K (0402) RCY041024Z
7 5 RESISTOR 2.2K (0402) RCY042224Z
8 5 RESISTOR 4.7K (0402) RCY044724Z
9 1 RESISTOR 22K (0402) RCY042234Z
10 1 RESISTOR 27K (0402) RCY042734Z
11 1 CAP. 0.1UF (0402) CK5104AK5X
12 2 CAP. 2.2UF (0402) CK6225AK6T
13 1 CAP. 0.33UF (0402) CK0334AK5X
14 1 CAP. 4.7UF CK0475AD7R
15 8 LED (0603) EX01Y40205
16 0 FUSE 0.2A 32V (0402) EX02Y40259
17 1 IC MIMD10A-7-F YNDCOMD10A
18 20 TACTILE SW EWPS33086X
19 1 PCB CONNECTOR 36P EX07Y49872
20 1 PCB FHA8-M108000GA EX07Y49911
21 ACCESSORY PORT:
In the side of the radio, you will find four connectors:
1 – USB: USB 2.0 compliance
2 – External mic, External PTT and RX serial data (2.5mm)
4
3
2
1
Mic (-)
RX Serial (TTL)
Mic (+)/PTT
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 54
3 – External Speaker, TX serial data (3.5mm)
4 – Accessory port
Pin Function Comments
GND Ground Main radio GND
SDA High Speed Serial data I/O 0-3V up to 400Khz
SCL High Speed Serial Clock 0-3V up to 400Khz
I/O 3 Digital Input/Output 1K Ohm, 0-3.3V
I/O 2 Digital Input/Output 1K Ohm, 0-3.3V
I/O 1 Digital Input/Output 1K Ohm, 0-3.3V
I/O 0 Digital Input/Output 1K Ohm, 0-3.3V
+V Accesory power 3.3Vdc @ 200 mA
Speaker (-)
TX Serial (TTL)
Speaker (+)
8 1
ST-2112D SM R 1.2 SMARTRUNK SYSTEMS, INC. 55
22 ST-2112 SERVICE MANUAL REVISIONS
AUTHOR RELEASE DATE REMARKS DANIEL MARTIN 1.1 JUN-2013 INITIAL RELEASE VERSION
DANIEL MARTIN 1.2 JUN-2013 ADDED SOFTWARE ZONE SPECIFICATION
Copyright 2014
Printed in Malaysia
www.smartrunk.com
ST-2112D SM R1.2
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